Pat beef ribs dry and dust with flour, salt and pepper.
Heat large dutch oven over medium-high heat and add oil. Sear ribs on all sides until well browned. Sear in batches to prevent steaming.
Drain all fat from dutch oven.
Prepare sauce by chopping chipotle peppers, garlic, onions and rosemary. Add to microwave safe dish along with beef broth, tomato paste, salt and pepper. Heat until hot and pour over ribs.
Bake at 325° for 2 ½ hours until meat is very tender. Remove fat with a ladle from the top every 30 minutes, OR prepare in advance and refrigerate. Remove fat once it has solidified on top. Reheat before serving.
Serve over mashed potatoes, polenta, or starch of choice. Garnish with fresh parsley and more fresh rosemary if desired.